adhd and hand flapping

hi, i have a almost 7 year old boy. he had been diagnosed with adhd and odd. he had been on meds for a few years now with dramatically improved his behaviour for the better. i have a few concerns. he always flaps his arms. and no matter how much i tell him to stop it is as thoe he connot. why? also he is very intellegent, but when asked a direct question he answers 20 other things and you must re ask the question 20 times. can you help me with my biggest concern the hand flapping

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